Ideal fault codes, explained.
Find your code below — each guide covers what it means, likely causes, safe checks, and when to call a Gas Safe engineer.
Ideal code library (43)
C0 Ideal Fault Code C0: Causes & Solutions C2 Ideal Fault Code C2: Causes & Solutions F1 Ideal Fault Code F1: Causes & Solutions F2 FN LN Ideal Fault Code F2 / FN / LN: Causes & Solutions F3 Ideal Fault Code F3: Causes & Solutions F4 L4 Ideal Fault Code F4 / L4: Causes & Solutions F5 L5 Ideal Fault Code F5 / L5: Causes & Solutions F6 Ideal Fault Code F6: Causes & Solutions F7 Ideal Fault Code F7: Causes & Solutions F8 L8 Ideal Fault Code F8 / L8: Causes & Solutions F9 L9 Ideal Fault Code F9 / L9: Causes & Solutions FA Ideal Fault Code FA: Causes & Solutions FAN FAULT Ideal Fault Code Fan fault: Causes & Solutions FD Ideal Fault Code FD: Causes & Solutions FLAME LOSS Ideal Fault Code Flame loss: Causes & Solutions FLAME ON BEFORE GAS ON Ideal Fault Code Flame on before gas on: Causes & Solutions FLAME ON BEFORE GAS VALVE Ideal Fault Code Flame on before gas valve: Causes & Solutions FLOW TEMP CANNOT REACH 80C Ideal Fault Code Flow temp cannot reach 80°C: Causes & Solutions FLOW THERMISTOR FAULT Ideal Fault Code Flow thermistor fault: Causes & Solutions FLOW RETURN REVERSED Ideal Fault Code Flow/Return reversed: Causes & Solutions FU Ideal Fault Code FU: Causes & Solutions IGNITION LOCKOUT Ideal Fault Code Ignition lockout: Causes & Solutions L1 Ideal Fault Code L1: Causes & Solutions L2 Ideal Fault Code L2: Causes & Solutions L4 F4 Ideal Fault Code L4 / F4: Causes & Solutions L5 F5 Ideal Fault Code L5 / F5: Causes & Solutions L6 Ideal Fault Code L6: Causes & Solutions LC Ideal Fault Code LC: Causes & Solutions LOW MAINS VOLTAGE Ideal Fault Code Low mains voltage: Causes & Solutions LOW WATER PRESSURE Ideal Fault Code Low water pressure: Causes & Solutions NO CH BUT DHW WORKING Ideal Fault Code No CH but DHW working: Causes & Solutions NO DHW BUT CH WORKING Ideal Fault Code No DHW but CH working: Causes & Solutions NO WATER FLOW FAULT Ideal Fault Code No water flow fault: Causes & Solutions OUTSIDE SENSOR FAULT Ideal Fault Code Outside sensor fault: Causes & Solutions OVERHEAT LOCKOUT Ideal Fault Code Overheat lockout: Causes & Solutions PCB ERROR Ideal Fault Code PCB error: Causes & Solutions PCB RECENTLY REPLACED Ideal Fault Code PCB recently replaced: Causes & Solutions PUMP ROTOR BLOCKED Ideal Fault Code Pump rotor blocked: Causes & Solutions RETURN THERMISTOR FAULT Ideal Fault Code Return thermistor fault: Causes & Solutions THERMAL FUSE LOCKOUT Ideal Fault Code Thermal fuse lockout: Causes & Solutions TOO MANY RESETS Ideal Fault Code Too many resets: Causes & Solutions TOO MANY RESTARTS Ideal Fault Code Too many restarts: Causes & Solutions WATER PRESSURE Ideal Fault Code Water pressure: Causes & Solutions
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